Ontario Police at the scene where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

“The death investigation of the two children in the 500 block of East Tam O’Shanter has led officers to believe this is a homicide. Investigators will be working throughout the night to uncover what took place,” the Ontario Police Department said in a tweet at 11:09 p.m.

Police did not immediately name a suspect or announce any arrests. It was not immediately known if detectives had interviewed the childrens’ mother, who had been found with the children injured and unresponsive in the garage; and was being treated at a hospital. It also wasn’t known if police had searched the garage and home.

A neighbor talks with Ontario Police at the scene where two children were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St. The mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

Neighbors sit and watch as Ontario Police investigate the home where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

Ontario Police at the scene where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

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Ontario Police Sgt. Bill Russell speaks during a press briefing at the scene where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

The home where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

Ontario Police at the scene where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

An Ontario Police officer stands in front of the home where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of East Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

An Ontario Police officer interviews a neighbor as he sits in his garage next door to the home where two children, a 4-month old and a 14-year-old, were found dead with their mother who was unresponsive in the 500 block of Tam O’Shanter St., the mother was transported to a local hospital in Ontario on Tuesday, Aug 20, 2019. (Photo by Terry Pierson, The Press-Enterprise/SCNG)

Investigators at the scene Tuesday where an infant and teen were found dead at a home in Ontario. Their mother was unresponsive and taken to a hospital for treatment. (Photo by Robert Gundran/Inland Valley Daily Bulletin)

A few hours earlier, police said no one was in custody as the investigation continued.

The children were girls, ages 14 years and 4 months, said Ontario Police Department Sgt. Bill Russell.

The nature of the mother’s injuries, described as minor and slight, was not immediately made public. Investigators planned to interview her. Officials did not immediately publicly identify the woman or the children who died.

Shortly after 4 p.m. Tuesday, police were called to the home, Russell said. At the home, officers had found the two children and their mother, who was unresponsive at the time, all in the two-story home’s garage.

Paramedics transported the mother to a local hospital where she was reported to be stable. The children were pronounced dead at the scene.

Police said personnel from the Ontario Fire Department ruled that death via carbon monoxide was unlikely, and that coroner personnel still had to establish the cause of the deaths.

A man identified as the father of the children and the woman’s husband made the initial call to police, Russell said. He was at the home when police arrived and was questioned. After his interview he was released by the department.

Russell said the scope of the investigation was currently limited to the residence. There was no threat to the neighborhood, police said in a tweet at 5:50 p.m.

Danny Calderon, a neighborhood resident, asked Russell if a loud bang on Monday morning had anything to do with the deaths. Russell told Calderon that the incident police responded to happened on Tuesday, and any noises that happened Monday are likely unrelated.

Priscilla Roman, a neighborhood resident, said she’s unaware of anything like this happening before in the neighborhood.

“We’re a really calm neighborhood, for the most part,” Roman said, while standing on the lawn of a home just around the corner from where the bodies and injured women were found. “Nothing like this has ever happened. I think there’s maybe been like one drug raid here (in the neighborhood), but nothing of this scope.”

She said she believes she’s seen the family before, but didn’t know them personally.

“We’re just trying to figure out what happened, because this is our neighborhood. It’s extremely sad and so close to home,” Roman said.

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